20375203987 has 4 divisors (see below), whose sum is σ = 21573745416. Its totient is φ = 19176662560.

The previous prime is 20375203951. The next prime is 20375203997. The reversal of 20375203987 is 78930257302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20375203987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20375203997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 599270689 + ... + 599270722.

It is an arithmetic number, because the mean of its divisors is an integer number (5393436354).

Almost surely, 2^20375203987 is an apocalyptic number.

20375203987 is a deficient number, since it is larger than the sum of its proper divisors (1198541429).

20375203987 is a wasteful number, since it uses less digits than its factorization.

20375203987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198541428.

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 20375203987 in words is "twenty billion, three hundred seventy-five million, two hundred three thousand, nine hundred eighty-seven".